The Side Outlet Roof Drain (Zurn 100C) is designed to handle heavy roof runoff while offering a versatile side-discharge configuration. By directing water laterally instead of strictly downward, this drain provides contractors and designers with more installation flexibility. This article covers the Zurn 100C Side Outlet Roof Drain in detail—its design, benefits, installation best practices, and a case study showing its reliability in action.

Side Outlet Roof Drain – Installation Schematic

What Is a Side Outlet Roof Drain?

The Zurn 100C Side Outlet Roof Drain is engineered for high-volume roof drainage where lateral piping connections are preferred or required. Instead of routing water straight down, the side outlet design allows for flexible alignment with horizontal piping systems. This makes it an excellent solution for projects where traditional vertical outlets are impractical or where redundancy and flow distribution are key.

Key Features & Benefits

• Side Outlet Configuration: Enables horizontal piping layouts for greater installation flexibility.
• Durable Build: Constructed from heavy-duty materials designed to resist corrosion and withstand harsh weather conditions.
• Dome or Strainer Option: Blocks debris while allowing strong water flow to the outlet.
• Adaptable Integration: Available in multiple outlet sizes and connection styles to fit existing systems.
• Reliable Flow Performance: Reduces risk of roof overflow and maintains consistent drainage during peak storms.

Zurn Brand Reliability

Applications & Use Cases

• Commercial rooftops where side outlet piping saves space
• Industrial facilities with complex drainage networks
• Institutional buildings needing efficient water routing (schools, hospitals, labs)
• Retrofit projects requiring non-vertical drainage options
• Large-scale roofing systems demanding flexible pipe alignment

Installation Tips & Best Practices

Installing a side outlet roof drain requires proper planning to optimize both slope and flow:

• Position the drain at the lowest roof point to ensure natural water collection.
• Match the outlet size and type with horizontal piping for balanced discharge.
• Install a strainer or dome cover to minimize debris entry and maintain flow efficiency.
• Carefully seal the flashing clamp or membrane to maintain waterproof integrity.
• Test the outlet connection under heavy flow conditions to confirm smooth discharge.

Side Outlet Roof Drain – Technical Schematic

Case Study: Multi-Tenant Office Complex

Challenge: A multi-tenant office building struggled with drainage bottlenecks using traditional vertical drains. The design made it difficult to tie into existing lateral piping, leading to overflow risks during storms.

Solution: Engineers replaced outdated units with Side Outlet Roof Drains at key locations. The side discharge simplified pipe routing, reduced installation costs, and provided more reliable flow paths.

Outcome: Over two storm seasons, the system maintained uninterrupted drainage performance. The lateral outlet connections improved hydraulics, prevented overflow, and allowed easier maintenance access.

Conclusion

The Side Outlet Roof Drain is a practical, high-performance solution for projects requiring flexible pipe routing. Its robust construction, strainer options, and efficient lateral discharge make it ideal for commercial, industrial, and institutional applications. With proper installation and upkeep, it delivers consistent reliability and drainage efficiency year after year.